acetic anhydride
3,3',5,8-tetramethoxy-4',7-bis(tosyloxy)flavone
Toluene-4-sulfonic acid 2-(4-benzyloxy-3-methoxy-phenyl)-3,5,8-trimethoxy-4-oxo-4H-chromen-7-yl ester
4′,7-dihydroxy-3,3′,5,8-tetramethoxyflavone
2-(4-benzyloxy-3-methoxy-phenyl)-3,5,7-trihydroxy-8-methoxy-chromen-4-one